Hi there,
trying to encrypt something with crypto++ and aes and i have a weired
problem.
When i encrypt and then decrypt, the decrypted texts first 16 bytes are
scrambled.
I am developing using Qt 4.8
Here is the code:
Making the password:
CryptoPP::SecByteBlock Encrypter::makeKey(int keySize)
{
CryptoPP::AutoSeededRandomPool rng;
CryptoPP::SecByteBlock secKey(0x00, CryptoPP::AES::MAX_KEYLENGTH);
rng.GenerateBlock( secKey, secKey.size() );
return secKey;
}
// encrypting a string to base64
QString Encrypter::encryptMessage(const QString &msg, const
CryptoPP::SecByteBlock &key)
{
CryptoPP::AutoSeededRandomPool rng;
byte iv[CryptoPP::AES::BLOCKSIZE];
rng.GenerateBlock(iv, CryptoPP::AES::BLOCKSIZE);
char buf[msg.length()];
CryptoPP::CFB_Mode<CryptoPP::AES>::Encryption cfbEncryption(key,
key.size(), iv);
cfbEncryption.ProcessData((byte *)buf, (byte
*)msg.toStdString().c_str(), msg.length());
QByteArray ret(buf, msg.length());
return ret.toBase64();
}
// decrypting string from base 64
QString Encrypter::decryptMessage(const QString &msg64, const
CryptoPP::SecByteBlock &key)
{
CryptoPP::AutoSeededRandomPool rng;
byte iv[CryptoPP::AES::BLOCKSIZE];
rng.GenerateBlock(iv, CryptoPP::AES::BLOCKSIZE);
QByteArray msg = QByteArray::fromBase64(msg64.toUtf8());
char buf[msg.length()];
CryptoPP::CFB_Mode<CryptoPP::AES>::Decryption cfbDecryption(key,
key.size(), iv);
cfbDecryption.ProcessData((byte*)buf, (byte*)msg.data(), msg.length());
QByteArray ret(buf, msg.length());
return QString(ret);
}
And here is the output:
================= Orig Message:
"<?xml version="1.0"?><msg rcpt="aggi"><txt><![CDATA[Dies ist eine
Test-Message]]></txt></msg>
"
================= Encrypted Message:
"Rx0p97beXpzc/kx7I0hlIm1IjDrkeR7hurTabRSisqGfRTwox3MFnM+n93naCLw75Na9Af+OG7IwI3KJYnX1QC8pmO7Bfl3Cq4B18xbHZbzuug0aPWhO4nGt3fiwbA=="
================= Decrypted Message:
" :wˆ 5 G ®¸¥ÿ .0"?><msg rcpt="aggi"><txt><![CDATA[Dies ist eine
Test-Message]]></txt></msg>
"
not all scrambled bytes were pasted in, it is always exactly 16 and not on
every block, even if i make a large text for encryption, its always only
the first 16
Any idea what this can be?
Thank you.
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